Ringless self-expanding piston



April 1, 1930. G. FLOYD 1,753,113

RINGLESS SELF EXPANDNG PISTOI\1 Filed July 29, 1926 IIIIIIIA attested Apr. i, 193e GEDRGE FLOYD, F @@RTSMOUTH, GHF) RXNGLESS SELF- ANDES@ FITON Application led July 39, 1926. serial No. 1.253%.

rl`his invention relates to improvements in pistons for hydrocarbon engines, and has for one of its objects to provide a novel, simple and highly eiicient device of this character that will preserve a tight sliding fit with the cylinder wall without the aid of the rings now used for this purpose.

lilith the foregoing and other objects in view, the nature of which will become ap- 0 parent as the description proceeds, the invention consists of theconstruction, combination and arrangement of parts hereinafter fully described and claimed, and illustrated in the accompanying drawing, wherein:

i Figure 1 is a sectional view taken on a plane extending verticallyv and centrally through a piston constructed in accordance with my invention,

Figure 2 is a sectional view taken on the I0 plane indicated by the line 2-2 of Figure l1,

Figure 3 is aA detail sectional View taken on the plane indicated by the line 3-3-of Figure , Figure 4 is a view in side elevation of a i5 fragmentaryv portion of the piston, and Figure 5 is a detail sectional view illustrating a slightly modified. construction of the piston. y Corresponding and like parts are referred p to in the following description, and designated in the several views of the accompanying drawing, by similar reference characters. y rEhe piston comprises a hollow cylindrical body 1 of which the upper or end wall 2 is made larger diametrically than theI side or L lateral wall 3 in order to provide an annular ange or shoulder 4. The body 1 is provided l on opposite inner sides of its .lateral wall 3 with bearing bosses 5 for the reception of a I wrist pin. Fach bearing boss 5 is provided in its lower side with a longitudinally eX- tending slot 6, and' at o posite sides of the slot with apertured lugs Split bushings 8 are mounted in the bearing lbosses 5, and bolts 9 carriedby the lugs 7 permit the bearing bosses and bushings to be adjusted to take up wear in the latter. The body 1 is provided in its side 3 with outer circumferential grooves 10 and 11. rThe grooves 10 are lo# cated adjacent the upper end of the body 1 elastic portions and the grooves 11 are located adjacent the provided with ribs' 13 which iit in the grooves 10 and 11 and, together with the flange or shoulder 4, support the sleeve sections against casual movement with respect to the body 1 in the direction of the axis thereof. The sleeve sections 12 are similar, and the adj acent edges thereof and the adjacent endsof the ribs 13 are beveled and arrangedy in overlapping relation, as shown at 14 1n Figure 2, the meeting edges of the sections 12a being tangenti-al of the body 1. The adjacent edges of the sleeve sections 12a arearrangeddiagonally, as shown at 15 in Figure'4. Elastic rings 16 of A the grooves 10 and llbetween the bottom walls of the grooves and the ribs 13 and function to hold the sleeve sections 12a under constant urge in the direction of the lateral wall of the cylinder.

`While they may be of any appropriate construction, the rings 16 are.

preferably made as shown in the drawing, that is they are corrugated transversely or in the direction of their width so as to present of arcuate formation contacting alternatel with the bottom walls of the grooves 10 an 11 and the ribs 13. The adjacent edges of the sleeve sections 12BL and the ends of the ribs 13,- may be curved, as shown at 17 in Figure 5, instead of being'straight as shown at '14 in Figure 2.

Due to its length, its sectional formation, and as its sections are under constant urge in the direction of the wall of the cylinder, the sleeve 12 will have such a tight sliding connection with the cylinder as to prevent gas and oil from leaking past the piston. Furthermore, the cylinder wall and sleeve cannot v wear unevenly, and the sleeve will prevent side slap of the piston'. The flange or shoulvder 4 and the ribs 13 prevent gas and from leaking past the cylinder between the body 1 and sleeve.

It should be understood that the drawing is merely illustrative and does not pretend to the split type are positioned in` oil give exact proportions. Furthermore, the

said drawing is illustrative of a preferred construction, it being m expectation that various changes and modifications may be made without departing from the spirit and scope of my invention.v

at is claimed is:

l. piston comprising a hollow cylindrical body rovided with circumferential grooves in its gateral wall, asleeve mounted on said `Wall of the bod and being of more than two sections, the si e edges of the sleevesections overlapping and being tangential of said body said sections being provided with ribs fitting in said grooves, the ends of the ribs being arranged-in overlapping relation, and corrugated spring elements positioned in said grooves between the bottom walls thereof and said ribs and exerting an outward pressure on the sleeve sections.

2. A piston comprising a hollow cylindrical body provided at its up er end with an annular shoulder-and provided in its lateral' wall and adjacent each of its ends with a plurality of circumferential grooves, a sleeve equal in length to and mounted on said wall of the body with its u per end in contact with said shoulder, said s eeve being of more than two sections and the side ed es of the sections thereof being arranged dgiagonally and tangentially and in overlap ing relation, ribs l carried by the sleeve sections and litting in said grooves and having their ends arranged 1n overlapping relation, and spring elements positioned in said grooves between the bottom walls thereof and said ribs and exerting an outward'pressure on the sleevesections.

.lin testlmony whereof` I ailix my si nature.

GEORGE FLYD, 

